Acura RSX DC5 & Honda Civic EP3 Includes DC5 Integra Type R & 5dr Civic hatchback

What octane gas do you notice the best performance?

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Old Nov 1, 2007 | 09:32 PM
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Default What octane gas do you notice the best performance?

On your EP3 or base RSX do you notice any better gas mileage or performance on any one octane. I know it only requires regular and I know what the octane in gas means. But I am just curious.


On my 89 hatchback I noticed the best gas mileage on plus gas (89) as compared to regular or premium.
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Old Nov 1, 2007 | 10:21 PM
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Default Re: What octane gas do you notice the best performance? (square_1)

Idk, I have to use 93 b/c im supercharged.
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Old Nov 2, 2007 | 02:14 AM
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91 will work good for you
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Old Nov 2, 2007 | 04:44 AM
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Default Re: What octane gas do you notice the best performance? (moores55)

yes 91 has been good for me.
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Old Nov 2, 2007 | 08:19 AM
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I use 91 and I think I can feel a bit more hop but can't tell a difference if I use Shell Premium ("92-95" octane) over 91.

91 FTW
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Old Nov 2, 2007 | 08:26 AM
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Default Re: What octane gas do you notice the best performance? (square_1)

if your looking for gas mileage i would not use 93 if the car only requires 89. You would just spend more money on 93.
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Old Nov 2, 2007 | 10:59 AM
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Default Re: What octane gas do you notice the best performance? (verycleanhatch)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by verycleanhatch &raquo;</TD></TR><TR><TD CLASS="quote">if your looking for gas mileage i would not use 93 if the car only requires 89. You would just spend more money on 93.</TD></TR></TABLE>

We've had this discussion before...the Ep3 actually runs better on 91 octane, even though it calls for only 87.

RSX-S, the higher, the better. I usually run 93 in mine, or 94 if Sunoco has it for a decent deal.
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Old Nov 2, 2007 | 12:33 PM
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Default Re: What octane gas do you notice the best performance? (Todd00)

Were i live it's 87,89,93. No 91.<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nahonda04 &raquo;</TD></TR><TR><TD CLASS="quote">91 will work good for you</TD></TR></TABLE>
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Old Nov 2, 2007 | 12:50 PM
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I live in LA and the highest i can find is 91. I know where they sell 100 up to 114 but nothing between 91 and 100.
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Old Nov 3, 2007 | 11:17 AM
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Default Re: What octane gas do you notice the best performance? (square_1)

93 octane for me
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Old Nov 3, 2007 | 01:55 PM
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93 all the way
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Old Nov 4, 2007 | 09:02 AM
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Default Re: What octane gas do you notice the best performance? (Todd00)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Todd00 &raquo;</TD></TR><TR><TD CLASS="quote">

We've had this discussion before...the Ep3 actually runs better on 91 octane, even though it calls for only 87.

RSX-S, the higher, the better. I usually run 93 in mine, or 94 if Sunoco has it for a decent deal.</TD></TR></TABLE>

runs better.. do you mean more mileage? if so would it provide enough mileage to off set the cost of premium gas?

rsx-s premium is recommended.
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Old Nov 4, 2007 | 09:42 AM
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Default Re: What octane gas do you notice the best performance? (verycleanhatch)

91.
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Old Dec 28, 2007 | 11:06 PM
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Default Re: What octane gas do you notice the best performance? (JDMsam.)

If i am getting an RSX Base 2002, can i use 87? Will it harm anything or use more gas b/c it is crappier so to speak?
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Old Dec 28, 2007 | 11:45 PM
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Default Re: What octane gas do you notice the best performance? (Soon2RideEX05)

99 octane v-power for my Type-R. honda recommend 100 but this is the closest you can get in the UK. ive tried it on 95 but the performance drops markedly. the only downside is that v-power costs around £1.08 (about $2) per litre here and a full tank (£60) lasts me for one weeks commuting! oh well, there has to be at least one down side to owning a DC5
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Old Dec 30, 2007 | 05:20 PM
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Default Re: What octane gas do you notice the best performance? (paul_c)

Since i drive an EP with the stock A3 motor, 87 octane works just fine.
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Old Dec 30, 2007 | 05:24 PM
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Default Re: What octane gas do you notice the best performance? (square_1)

93
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Old Dec 30, 2007 | 05:46 PM
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Default Re: What octane gas do you notice the best performance? (mannydc5)

if its a base rsx or ep3. . . just use regular. . .

they have low compression engines, high octane will do nothing for you but use your money up faster
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Old Dec 30, 2007 | 06:06 PM
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Default Re: What octane gas do you notice the best performance? (EP3Moschini)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EP3Moschini &raquo;</TD></TR><TR><TD CLASS="quote">if its a base rsx or ep3. . . just use regular. . .

they have low compression engines, high octane will do nothing for you but use your money up faster</TD></TR></TABLE>

Please don't spread misinformation.

While premuim is indeed more expensive, the EP3 will adapt to the higher octane gas and give you a little more HP. This was confirmed on a dyno. It'll take a tank or so, but you'll see some more power if you have the $$ to burn on premium.

The ECU is what makes this happen as it adjusts timing accordingly.
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Old Dec 30, 2007 | 06:50 PM
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Default Re: What octane gas do you notice the best performance? (square_1)

Honestly its always been my understanding that octane has no real influence on the overall BTU value of gasoline. Octane is an additive used to deture detonation under high tempratures so if your running a low compression ratio in the 8-9.5 range I dont see any real advantage to using 91 or 93, just more money spent on fuel.

Now if you choose to run a higher CR or Boost then you must run higher octane gasoline or say bye bye to your motor.
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